My experience has been there are two kinds of gate agents: Those who are happy to check when they have a moment and those who **** near refuse to tell you anything about the list, guarding it like a State secret. The latter are very frustrating; they may (!) be well-intentioned, not wanting you to draw conclusions based on changing information, but they should leave that to us - let us decide for ourselves whether to board or not while refraining from blaming them if we are pushed down the list by someone with higher priority after thinking we were going to make it.
Okay.....I admit it, this is a pet peeve - but if anyone knows a way to check the list without bothering the agent, I'm game.